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Deferred Acquisition Costs and Other Actuarial Balances - Retirement and Income Solutions - Balances and changes in DAC (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | $ 3,950.5 |  |
Amortized to expense | (392.5) | $ (389.8) | $ (386.9)
Ending balance, Deferred acquisition costs | 4,006.9 | 3,950.5 |
Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 918.9 |  |
Amortized to expense | (95.2) | (95.8) | (101.0)
Ending balance, Deferred acquisition costs | 957.2 | 918.9 |
Workplace savings and retirement solutions | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 506.4 | 498.0 |
Costs deferred | 47.7 | 48.1 |
Amortized to expense | (38.6) | (39.7) |
Ending balance, Deferred acquisition costs | 515.5 | 506.4 | 498.0
Individual variable annuities | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 279.5 | 278.0 |
Costs deferred | 72.7 | 27.4 |
Amortized to expense | (28.8) | (25.9) |
Ending balance, Deferred acquisition costs | 323.4 | 279.5 | 278.0
Pension risk transfer | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 15.4 | 8.1 |
Costs deferred | 6.6 | 7.9 |
Amortized to expense | (0.9) | (0.6) |
Ending balance, Deferred acquisition costs | 21.1 | 15.4 | 8.1
Individual fixed deferred annuities | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 106.1 | 131.0 |
Amortized to expense | (21.9) | (24.9) |
Ending balance, Deferred acquisition costs | 84.2 | 106.1 | 131.0
Investment only | Retirement and Income Solutions |  |  |
Deferred Acquisition Costs |  |  |
Beginning balance, Deferred acquisition costs | 11.5 | 14.9 |
Costs deferred | 6.5 | 1.3 |
Amortized to expense | (5.0) | (4.7) |
Ending balance, Deferred acquisition costs | $ 13.0 | $ 11.5 | $ 14.9

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